Originally posted by born4linux
i think this is a customized phpbb. i've tried in a LAN and it works great. U can get it here: http://www.phpbb.com/
As it states at the bottom of each page, this forum is based off of vBulletin. They have two versions I know of, a free stripped down version and one that costs money.
Though I believe jeremy paid for this when he created this site, it has been highly hacked to LQ's needs, etc.